A Simple Puzzle

hint: Panels 7, 12, and 21 are already in the correct position.

If you get the correct sequence, I can't offer you a prize or anything but you will have my undying respect. And I'll buy you a beer the next time I'm in your neighborhood.

I'll post the correct sequence in a few days.

EDIT: Thanks to Randall for pointing out the error in the ciphertext in panels 9 and 17. Fixed.

EDIT2: I posted the solution.